steward



June 17, 1930.A R. B. STEWARD SHIP S DAVIT Filed April 50, 1929 2 Sheets-Sheet l ATTORNEY June 17, 1930. R. B. `sTEwARD 1,763,908 i sHIPs DAVIT Filed April so, 1929 z sheets-sheet 2 ngl -4 l Z5 V20 ATTORNEY Z lNvE 0R42 V Patented `lunev 17, 1930 UNITED rares tresses PATENT orrice ROBERT' B. STEWARD,

OF NEW YORK, N. Y.

SHIP S DAVIT structed and arranged that the boat supported by the davit may be swung to outboard position by the action ot' gravity by successive swinging movement of pivoted members of the davit construction, and may be swung back into inboard position by reverse movements oi said members. Trackways and like obstructions are not employed.

The invention will be described with reerence to the accompanying drawings, in which- Figure 1 illustrates an embodiment of the invention in side elevation mounted upon the deck frame of a ship, the davit'lying in inboard position, and

Figure 2 is a similar view showing the position of the davit outboard;

Figure 3 is a side elevation of opposed davits from inboard position;

Figure 4 is a fragmentary View in rear elevation of a joint connecting two of the davit members;

Figure 5 is a similar View showing inV dotted lines the position of the parts with the uppermost of said members swung outward to iinal position, and

Figures 6 and 7 are separate views ot' the members separated.

In the present embodiment the davit comprises a bracket member 1 adapted to be directly connected to the metal deck frame 2. For this purpose the bracket is provided with opposed flanges 3 having apertures for the passageway of bolts 4 connected to 2. The deck covering of the ship is indicated at 5. Pivotally mounted at 6 upon bracket 1 is the lovvermost davit member 7. In the present instance the member 7 is formed with the outer leg a and the inner leg aa'.

An intermediate davit member 8 is pivoted at 9 to lower member 7. For this purpose lower member 7 is formed at its upper end with a centrally disposed passageway 10 to receive a lug 11 depending from member 8,

as is illi'lstrated more particularly in Figs.l

4 to 6 inclusive. Above lug 11 and at each 1929. Serial No. 359,206.

face thereotl davit member 8 is formed with a seat 12 extending in an oblique line relatively to the longitudinal axis of member 8. rlhe upper face oi' davit member 7 eX- t'cnds in a line horizontal to the aXis of said member at 7X and thence angularly at 7X, the degree of the angle beingthe same as that of faces 12. vWhen the parts are assembled and the davit is inboard, face 7XX is in vcontact with faces 12 and affords a stop against movement ot' member `8 relative to member '7, except in an outboard direction.

Pivotally mounted upon davit member 8,

t 13, is the uppermost davit member 14, said member being curved to generally correspond with the curvature of ships davits of the usual construction. The form and arrangement of the connection and the contiguous faces of davit members 8 and 14 are the same as those of davit members 7 and 8 and do not require detailed description, the seat at the upper end of davit member 8 being indicated at 14X.

Referring to Fig. 3 I have shown a power driven drum 15 on a shaft 16 which extends to a second drum 17. Drum 15 is connected to a line 18 and line 18 is rst led over a guide pulley 19 mounted on bracket 2O ot davit member 14, the line then engaging a guide pulley 21 near the top oil vdavit;member 14 and thence passing over sheave 22 for connection to the boat 23.

Drum 17 has lconnected thereto a line 24, led over a guide pulley 25 rotatably mounted on bracket26 carried by the second of the companion davits, the line thence engaging guide pulley 27 and being led over sheave 28 for connection to boat 23. That portion of the boat opposite either one of the davits lies generally within the dotted lines 29, Fig. 1, the boat at its major transverse area being indicated by the full lines in said figure.

In the operation of the embodiment above described, release of` the lines 18, 24 will enable action of the davit as follows The gravity pull of the boat upon davit member 14 will cause said member to swing on its pivot 13, carrying the `boat outwardly and downwardly to the position A, Fig. 1, the said davit member 14 lying inthe posirelease of the line will cause a swinging movement of the lowermost davit member 7 from the position illustrated in Fig. 1 to the position illustrated in Fig. 2, and leg (L will be brought into engagement with the ship structure,'the latter affording a stop against further outboard movement of the davit. The boat has been swung not only outboard but away from the side of the ship.

By means of the invention a very simple combination of elements is employed wherebythe weight of theboat is caused to successively swing elements of the davit to outboard position, the boat being automatically swung outboard and lowered. In this operation there is no bodily movement between the lowermost or baseV davit member and its support, the movement being pivotal. This is an advantage over structures designed to generally achieve the same purpose since the use of trackways is avoided and the restoring of the boat and davit to inboard position requires less power, the elements of the davit acting successively as levers in swinging the boat inboard.

It will be understood that various modifications may be made in the form and arrangement of the elements shown and described without departing from the spirit of the invention, what I claim and desire to secure by vLetters Patent being 1s-follows;-d

1. In gravity davits for ships, a lowermost davit section having opposed laterally projecting stop members and adapted to be pivotallyv connectedv to the ship structure at a point intermediate said stop members, an uppermost davit section, and an intermediate davit section pivotally Y connecting the lowermost and uppermost sections.

2. In gravity davits for ships, a lowermost davit section having opposed laterally projectihg stop members and adapted to be pivotally connected to the ship structure at a point intermediate said stop members, 'an uppermost davit section, an intermediate davit section pivotally connecting the lowermost and uppermost sections, a pully carried bythe uppermost davit section, and a guiding and fulcrum element carried'by the intermediate davit section, the said guiding and fulcrum member being so. related to the pulley that a line" extended over the two will serve to swing the uppermost davit section at its pivot-al connection upon the intermediate section.

3.. In gravity davits for ships, a` lowermost davit section having opposed laterally pro- ]ecting stop members and adapted to be pivotally connected tothe ship structure at a point intermediate said stop members, an uppermost davit section, an intermediate davit section pivotally connecting the lowermost and uppermost sections, a pulley carriedk at the end of the uppermost davit section, a bracket carried by the innermost section and av sheave carried by said bracket, as and for the purpose set forth.

l. A gravity davit for ships constructed in accordance withY claim 1, in which the pivotal connection intermediate the davit sectionscomprises a lug at `the end of one section, a socket formed in the opposed section and receiving said lug, the overhanging wall at each side of said lug extending diagonally with respect to the longitudinal axis of the davit sect-ion on which it is formed and the socke'ted davit section being formed with angularly related upper faces at eachl side yof the-socket affording two seats for the davit section carrying said-lug.

l 5. In gravity davits for ships, a lowermost davit sect-ion, an uppermost davit section, and an intermediate davit section pivotally connecting thelowermost and uppermost sections, said davitsections at points of mutual contact being formed with two sets of'stop surfaces, the first set mutually engaging when the davit is inboard and the second set mutually engaging when the davit is outboard and opposed legs carried by the lowermost davit section, as and for the purpose set forth. I Y

In testimony whereof, I have signed my name to this specification. Y I

' ROBERT BRUCE STEVVARD. 

